"Effective UID is not root (euid=XXXX egid=XXXX uid=XXXX gid=XXXX) (rc=-10)"

[FuzzyLittleDuckling]

VirtualBox does not start in Fedora 22 unless run by root, otherwise it gives the following error:

Effective UID is not root (euid=XXXX egid=XXXX uid=XXXX gid=XXXX) (rc=-10)

I have tried reinstalled many times, running with a different user, as well as multiple versions (4.2, multiple variants of 4.3, and even the 5.0 beta), and all of them give the same error. Other people seem to have encountered this problem but none of their solutions (namely, reinstalling) seem to work. This makes VB completely unusable for non-root users.

[Frank Mehnert]

Cannot reproduce. Which VirtulBox package did you install on your Fedora 22 system (exact package name please)?

[genterminl]

I'm running 4.3.28 under Gentoo Linux, and have no problems running VirtualBox as a regular user. However, if I try to run "strace VirtualBox" then I get that error. I don't know if this helps with the original problem, or is actually a completely separate issue. To the OP, I would check whether virtualbox is correctly installed SUID. (on Gentoo, that's /usr/lib/virtualbox/VirtualBox, but I don't know what it would be under Fedora.)

[Frank Mehnert]

Getting this error if VirtualBox is started with strace is completely normal. strace will run the VirtualBox stub as normal user and that will not work. The hardened stub opens a privileged device (/dev/vboxdrv), then drops all privileges and runs as normal user process. Running as strace-wrapped process, opening the device is not possible.

[Frank Mehnert]

Oh, I think it works if you make strace SUID root.